Project VulcanCentaur

DaveS

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I a couple of weeks ago the news that Roskosmos sent its engineers to fix the errors of the raptor engine
Raptor is SpaceX and only used on Starship and its booster. And Roscosmos have nothing to do with Starliner which is Boeing's creation.
 

francisdrake

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Just a short update on what is going on: Making some tests for a non-fairing variant. These special payload adapters will probably have to be tailor-made for each spacecraft.

Trying to implement a pitch-autopilot to ease orbit injection, but this will take some time. Currently I get all bad habits of ill-designed control loops, like over- and under-steering, oscillation around the target value, and so on.

Also the Vulcan Centaur seems to have an unusual flight profile. Towards the end of the core stage burn, the stack needs to pitch up a lot, to gain vertical speed. This is because the thick Centaur is so under-powered with its 2 RL-10 engines, so it would drop back into the atmosphere otherwise.
Maybe this will be countered by fully fueling the Centaur only for the heaviest payloads, and partial fueling for all others.
This will be interesting to learn when the first flight profiles or real launch data become available.
 

francisdrake

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New version 04 on the front page!

Whats new: Added a very basic launch autopilot. Starts with [V}. It controls the pitch of the first stage only. It performs the ascent pitch-over and the upward kick at the end of the 1st stage burn.
The Centaur still has to be controlled manually.

The autopilot is somewhat useful for the 0, 2 and 4 SRB variants, but ends up too high for the 6 SRB configuration. Still a lot of work to do here.

Other minor improvements are tank venting while still on the ground and non-fairing scenarios for the Star Liner and the Dream Chaser.

Have fun to fly and let me know on your experiences! :)
 

francisdrake

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Thanks for the nice words!
I am playing around to make a Tenacity Dream Chaser (cargo version) with the Shooting Star module.
Needs the six booster version VC6L with the long fairing.
The Dream Chaser is a freely available model by HappyEnte.
I just put a black over the cockpit to simulate the cargo version.
 

Soumya-8974

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Raptor is SpaceX and only used on Starship and its booster. And Roscosmos have nothing to do with Starliner which is Boeing's creation.
He was probably confused with the Raptor engine (used on Starship) and the BE-4 engine (used on Vulcan, made by Blue Origin) as both engines run on liquid methane and LOX. However, a major difference between them is the BE-4 uses a simple staged combustion cycle, while the Raptor uses a complex full-flow staged combustion cycle.

Side note: I have just heard that Rocket Lab's Neutron rocket will run on an open-cycle methalox engine, and although it is less efficient than the BE-4 or the Raptor, its manufacturing cost is said to be lower than the two.
 
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barrygolden

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where or when can we download that new DC and you might put some windows in it as well for a manned version. The Hermès Cockpit would look good in it as well
 

francisdrake

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where or when can we download that new DC ...
That will still be a few weekends from now. :cool:
Main reason are the RCS nozzles of the Dream Chaser being off the mass center. I try to balance that with slightly different thrust levels, and this is tedious. Not balancing would lead to unwanted rotation during translation, which makes docking nearly impossible.

Also will look into the reverse view required for docking. This view direction reverses the action of the left-right and roll thruster keys.
 

CurlSnout

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For fun, have been playing around with VC variants and alternative payloads - which may or may not be sanctioned by ULA.

1) Kulch's space tug 'DM-2':

VC-DM-2_01.jpg

VC-DM-2_02.jpg

2) Kulch's space tug 'Smerch':

VC-Smerch_01.jpg

VC-Smerch_02.jpg

3) igel's Molniya-1:

VC-Molniya-1_02.jpg

VC-Molniya-1_01.jpg

Hi-Ho,

cs
 

Gargantua2024

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Also will look into the reverse view required for docking. This view direction reverses the action of the left-right and roll thruster keys.
I think Dream Chaser Cargo will be grappled by the Canadarm2 and then berthed to the station via CBMs similar to Cygnus and Cargo Dragon 1, but yeah the controls will be reversed due to that aft docking orientation
Screenshot_20220118-075307-01.jpeg
 
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